Chiraloxazolines, as their boron enolates derived from various boron triflates, react with aldehydes to give erythro-selectivity (97% + %) with enantiomeric purities of 50–60%. Achiral oxazolines as their boron enolates derived from diisopinocampheylborane give, on reaction with aldehydes, β-hydroxy esters with high threo-selectivity (90+%) in 77–85% ee. A variety of structurally different oxazolines
Asymmetric aldol reactions with (+)-(S,S)-pseudoephedrine. Stereoselective synthesis of α-methyl β-hydroxy esters
作者:Jose L. Vicario、Dolores Badía、Esther Domínguez、Luisa Carrillo
DOI:10.1016/s0040-4039(98)02082-6
日期:1998.12
A new methodology for performing aldolreactions with an excellent degree of enantio- and diastereoselectivity was developed employing (+)-(S,S)-pseudoephedrine as chiral auxiliary.
Asymmetric synthesis catalyzed by chiral ferrocenylphosphine-transition metal complexes. 3. Preparation of optically active allylsilanes by palladium-catalyzed asymmetric Grignard cross-coupling